Bearing pulling tool



Feb. 25, 1936. v. BLISS 2,031,998

BEARING PULLING TOOL Filed April 26, 1955 Ruin 16 I 517512!" LDUI'J IZBLIEE I Km BY 7 flfiy Patented Feb. 25, 1936 UNITED STATES PATENTOFFICE Application April 26, 1935, Serial No. 18,483 In Canada July 24,1934 1 Claim. (Cl. 29-883) This invention relates to a tool for pullingor extracting annuli seated in members having cylindrical interiors, forexample, for extracting internally seated bearings, bearing cups, etc.

Heretofore there have been in use tools for pulling externally seatedbearings or bearings seated internally in cylindrical depressions.However. with the tools adapted for use in the latter case it ispractically impossible to remove bearings from members havingcylindrical interiors when the bearings are placed at a distance fromthe bottom or end of the member. Another objection to the use of theselast mentioned tools is the fact that it is necessary to place certainparts of a tool on the bottom of the depression in order to be able toplace the remaining parts in operative position and finally to adjustthe tool for the pulling operation.

These objections are overcome by providing a tool comprising a shaft,jaws carried by the shaft adapted to be brought into contact with thehearing by means of a tapered head also carried by the shaft, means forholding the jaws in operative position, means for carrying the load andmeans for operating the tool to remove the bearing, as more fullydescribed in the following specification and illustrated in theaccompanying drawing, in which Figure l is a side elevation of the toolshown mounted on a cylindrical member in operative position, thecylindrical member and bearing seated therein being shown in section.

Figure 2 is a section taken on the line 2--2 of Figure 1.

Figure 3 is a section taken on the line 3-3 of Figure 2.

Figure 4 is a fragmentary sectional view taken on the line 4-4 of Figure3.

Referring more particularly to the drawing, A is the improved tool and Bis the member having a cylindrical interior in which bearing C isseated. The tool A comprises a screw threaded shaft 6 having a reducedportion 1 at the lower end thereof. Mounted on the reduced portion 1 isa tapered head 8 having parallel sides 9 and Ill and upwardly convergingrounded ends II and I2. Jaws l4 and I5, one of which is slightly longerthan the other, are formed with outwardly projecting lugs l6 at theirlower ends and with portions I! at their upper ends bent inwardly atapproximately right angles thereto, said portions I! being provided withopenings I8 somewhat larger in diameter than shaft 6 whereby the jawsare loosely carried by the shaft. Jaws I4 and I5 are transverselycurved, as shown in Figure 3, so that their inner faces fit over thecurved ends II and I2 of head 8, and their outer faces fit within thecurve of the bearing 0. j

A load-bearing block I 9 threaded on shaft 6, is adjustablelongitudinally thereof. The position 5 assumed by block IS on the shaftdepends on the size of bearing C. When the bearing is relatively wide,as shown in Figure 1, block I9 is set so that when the portions I! restthereon the lower ends of the jaws bear against head 8 at its widest 1point. However, for narrower bearings, block I9 is moved upwardly onshaft 6 so that the lower ends of the jaws bear against head 8 at anarrower point, this being possible due to the fact that the jaws areflexible. In this manner the 15 tool may be used for pulling bearings ofvarious sizes. Head 8 may be replaced by a larger or smaller head if itis desired.

Threaded on shaft 6, above portions I1, is a nut 2| which may be screweddownwardly against 20 said portions to hold the jaws firmly in theiroperative position.

A hollow dome-shaped housing 22 is loosely mounted on shaft 6 by meansof an orifice 23 the diameter of which is slightly greater than 25 thatof the shaft, and is provided with relatively large openings 24 in eachside thereof. It is adapted to be moved longitudinally of shaft 6 by ahandle 25 screw-threaded onto the upper por- 30 tion of said shaft abovethe housing.

The tool is used as follows:-

Nut 2| is moved upwardly on shaft 6 and the block l9 adjusted thereon sothat when the portions I! of the jaws I 4 and I5 rest thereon, their 35lower ends will be spread by head 8 to fit tightly within the bearing tobe pulled. Next, the jaws are raised from block l9 until their lowerends swing inwardly against the shaft to allow the lower end of the toolto be inserted within the 40 bearing. Then the jaws are released and nut2| screwed downwardly onto portions I! to firmly hold the jaws in place.Housing 22 is placed on member B and handle 25 is turned until it bearsagainst the top of the housing. By continuing 5 to turn the handle,shaft 6 is drawn outwardly and lugs l6 bearing against the lower part ofbearing C pull it outwardly until it is withdrawn from member B. As thebearing is being pulled, the operator may keep sight of the lower partof the tool and may make any necessary adjustments thereto throughopenings 24.

From the above it will readily be seen that a tool has been providedwhich may be very easily adjusted and placed in operating position 2oJecting lugs and being movable toward and away in a member with acylindrical interior to pull a bearing seated therein.

Various modifications may be made in this invention without departingfrom the spirit thereof or the scope of the claim, and therefore theexact forms shown are to be taken as illustrative only and not in alimiting sense, and it is desired that only such limitations shall beplaced thereon as are disclosed in the prior art or are set forth in theaccompanying claim.

What I claim is:-

A device for pulling annuli seated in members having cylindricalinteriors, comprising a screwthreaded shaft, transversely curved jawshaving portions turned in at substantially right angles thereto, saidinturned portions having openings therein of a diameter slightly largerthan that of the shaft whereby the Jews are slidable on the shaft, thelower ends of the iaws having profrom the shaft, a head mounted on theshaft for spreading the lower ends of the jaws to grip the annulus, saidhead having parallel sides and transversely curved ends which convergetowards the top thereof, a nut threaded on the shaft on the side of theinturned portions removed from the extremities of the jaws and a loadtaking block threaded in the shaft on the other side of the inturnedportions, said nut andload taking block being adapted removably to holdthe Jaws in expanded position and against longitudinal movement at anydesired point on the shaft, a dome shaped housing slidable on the shaftand adapted to rest on the member from which the annulus is to bepulled, said housing having relatively large openings through which thejaws may be seen, and means for drawing the shaft and thus the annulusoutwardly into the housing.

LOUIS VENCIL BLISS.

